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A108974 as a simple table

n a(n)
1 3
2 7
3 5
4 31
5 127
6 17
7 73
8 11
9 23
10 89
11 13
12 8191
13 43
14 151
15 257
16 131071
17 19
18 524287
19 41
20 337
21 683
22 47
23 178481
24 241
25 601
26 1801
27 2731
28 262657
29 29
30 113
31 233
32 1103
33 2089
34 331
35 2147483647
36 65537
37 599479
38 43691
39 71
40 122921
41 37
42 109
43 223
44 616318177
45 174763
46 79

[3,7,5,31,127,17,73,11,23,89,13,8191,43,151,257,
 131071,19,524287,41,337,683,47,178481,241,601,
 1801,2731,262657,29,113,233,1103,2089,331,
 2147483647,65537,599479,43691,71,122921,37,109,
 223,616318177,174763,79]

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Last modified February 28 09:06 EST 2020. Contains 332323 sequences. (Running on oeis4.)